Vacuum deoxygen column design

[jeap]

Hi all!

I'm trying to dimension a vacuum deoxygen column to pretreat 170 m3/h of river water to be injected in an oilfield. The oxygen and other dissolved gases are removed from water by means of vacuum generated with a liquid ring pump. The process is carried out at 25ºC and 35 mmHg (abs).

However, since this is a vacuum process I'm not sure if the gas/vapour flowrate I considered is ok. I took into account dissolved gases plus water vapor in a flowrate of 50 sm3/d (from an existing process with this pump capacity).

I've followed recommendations and procedures to dimension packed towers in the usual manner. Dimensions I obtained at first seem to be right. (1.2 m diameter, 3 m packing height, HDPE pall rings 1")


Do you have some advice?

And some details on the internals design also be welcome.

Thanks in advance.

 

[sshep]

Jeap,

Your numbers seem reasonable for the data given, but don't forget to add some extra vacuum capacity to account for some amount of air intrusion.

Also it wasn't clear if your tower will use heat (i.e. low pressure steam injection) to assist in deaerating your water and also allow for winterized operations. If so, there will be a few other considerations.

best wishes,
sshep